1. You can't advertise any of the 3rd party sites in your profile, signature, screenshots, in names of files or in archives. Also don't forget it is forbidden to place links/banners to any 3rd party sites on your picture hosts and/or file hosts pages.
2. Using logos of any of the allowed file or picture hosts is not allowed. 3. You may not use refferal/affiliate links of any of the file or picture hosts.